EP1731935A1 - Lwl anordnung - Google Patents

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Publication number
EP1731935A1
EP1731935A1 EP05721542A EP05721542A EP1731935A1 EP 1731935 A1 EP1731935 A1 EP 1731935A1 EP 05721542 A EP05721542 A EP 05721542A EP 05721542 A EP05721542 A EP 05721542A EP 1731935 A1 EP1731935 A1 EP 1731935A1
Authority
EP
European Patent Office
Prior art keywords
grooves
adhesive
substrate
optical fiber
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05721542A
Other languages
English (en)
French (fr)
Other versions
EP1731935A4 (de
Inventor
Hironori c/o IBIDEN CO. LTD. TANAKA
Naoaki c/o IBIDEN CO. LTD. FUJII
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ibiden Co Ltd
Original Assignee
Ibiden Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ibiden Co Ltd filed Critical Ibiden Co Ltd
Publication of EP1731935A1 publication Critical patent/EP1731935A1/de
Publication of EP1731935A4 publication Critical patent/EP1731935A4/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
    • G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3648—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures
    • G02B6/3652—Supporting carriers of a microbench type, i.e. with micromachined additional mechanical structures the additional structures being prepositioning mounting areas, allowing only movement in one dimension, e.g. grooves, trenches or vias in the microbench surface, i.e. self aligning supporting carriers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3664—2D cross sectional arrangements of the fibres
    • G02B6/3668—2D cross sectional arrangements of the fibres with conversion in geometry of the cross section
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
    • G02B6/3684—Mechanical coupling means for mounting fibres to supporting carriers characterised by the manufacturing process of surface profiling of the supporting carrier
    • G02B6/3692—Mechanical coupling means for mounting fibres to supporting carriers characterised by the manufacturing process of surface profiling of the supporting carrier with surface micromachining involving etching, e.g. wet or dry etching steps
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3855—Details of mounting fibres in ferrules; Assembly methods; Manufacture characterised by the method of anchoring or fixing the fibre within the ferrule
    • G02B6/3861—Adhesive bonding
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
    • G02B6/3885—Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type

Definitions

  • the present invention relates to an optical fiber array.
  • optical fiber arrays in which a substrate with housing grooves for housing optical fibers formed therein and a cover plate for covering the optical fibers are joined with adhesive, wherein relationships such as distance between the substrate and the cover plate are defined to increase the adhesiveness therebetween.
  • the optical fiber array described in JP-A 2001-343547 keeps the distance between the outermost housing grooves and the end portions of the substrate, the distance Y between the substrate and the cover plate, and the distance L between the contact points through the housed optical fibers and the housing grooves and the cover plate, respectively, within certain ranges to increase the adhesive strength therebetween so as not to allow the optical fibers to be displaced from the center positions of the housing grooves, which prevents the transmission characteristics of optical signals from being degraded.
  • optical fiber arrays in which adhesive surfaces of a substrate and a cover plate are devised when joined with adhesive to increase the adhesive strength therebetween.
  • the surface between the housing grooves that are formed in the substrate to house the optical fibers and the end portions of the substrate is made to have rough surface to increase the adhesive area and thereby the adhesiveness, which prevents the transmission characteristics of optical signals from being degraded.
  • the adhesive forming the adhesive layer has a thermal expansion coefficient greater than that of glass, etc., forming the substrate and the cover plate, the adhesive layer and the substrate do not show the same behavior when curing shrinkage and/or temperature change, etc., may occur in the adhesive layer, resulting in compressive stress or tensile stress in the optical fibers due to the behavior of the adhesive layer.
  • the present invention has been made in consideration of the above-described problems , and an object thereof is to provide an optical fiber array capable of keeping good transmission characteristics.
  • optical fiber array according to the present invention has employed the following means to achieve the foregoing object.
  • an optical fiber array of the invention includes:
  • the adhesive grooves formed between the housing grooves and the end portions of the substrate are introduced thereinto the adhesive layer to increase the adhesive area between the substrate and the cover plate.
  • the substrate has a rigidity greater than that of the adhesive layer, whereby the adhesive layer is introduced into the adhesive grooves to allow the forming faces of the adhesive grooves to control the behavior of the adhesive layer caused by expansion/shrinkage in the adhesive layer. Since this increases the adhesiveness so as not to allow the optical fibers to be displaced in the housing grooves, it is possible to keep good transmission characteristics.
  • the adhesive grooves are each preferably formed cross-sectionally into an approximately V shape, although not particularly restricted thereto. This allows the adhesive grooves to be formed in the surface of the substrate relatively easily.
  • the angle ⁇ between the forming faces of the adhesive grooves that are each formed cross-sectionally into an approximately V shape is preferably 55 to 95°, more preferably 65 to 85°, and most preferably 60 to 80°.
  • the angle ⁇ is less than 55°, it is difficult to fill the bottom part of the V shape with adhesive, resulting in a possibility of a crack and/or peeling of the adhesive layer starting from the bottom part of the V shape, while when the angle ⁇ is more than 95°, it is difficult to control the behavior of the adhesive layer by the forming faces of the adhesive grooves.
  • the adhesive grooves may be formed approximately parallel with the housing grooves housing the optical fibers, although not particularly restricted thereto. Since this causes the scanning direction when forming the adhesive grooves to be approximately the same as that when forming the housing grooves, it is easy to form the adhesive grooves.
  • the adhesive grooves are preferably formed in the vicinity of the outermost housing grooves among the housing grooves, although not particularly restricted thereto. This allows stress due to expansion/shrinkage in the adhesive layer that may be applied significantly onto the adhesive surface, etc., in the vicinity of the outermost housing grooves to be reduced by the forming faces of the adhesive grooves to easily increase the adhesive strength. Also, the adhesive grooves are preferably formed in the vicinity of the end portions of the substrate. This allows the adhesive area and thereby the adhesiveness in the end portions of the substrate, where there is a possibility of, for example, moisture immersing through the external limit between the substrate and the adhesive layer to reduce the adhesiveness therebetween, to be increased to keep good transmission characteristics.
  • At least one adhesive groove is preferably formed between the outermost housing grooves among the housing grooves and the end portions of the substrate, and a plurality of the adhesive grooves may be formed, although not particularly restricted thereto.
  • the adhesive layer can be introduced thereinto so as to increase the adhesive area and the behavior of the adhesive layer due to expansion/shrinkage in the adhesive layer is controlled by the forming faces of the adhesive groove, thereby the adhesiveness is increased to keep good transmission characteristics.
  • the adhesiveness is also increased to keep good transmission characteristics.
  • the value of G/W is an occupation rate
  • W is referred to as substrate end portions width representing the width between the opening edges of the outermost housing grooves and the end portions of the substrate
  • G is referred to as total adhesive grooves width representing the summation of the widths of a plurality of the adhesive grooves when formed between the opening edges of the outermost housing grooves and the end portions of the substrate
  • the value of the occupation rate G/W is preferably in a range of 0.03 to 1.0.
  • the value of G/W is less than 0.03 the area where the adhesive grooves are formed is so small that it is difficult to control the behavior of the adhesive layer by the forming faces of the adhesive grooves.
  • the adhesive grooves are each preferably formed to have a depth of 5 to 200% of that of the housing grooves.
  • the depth of the adhesive grooves is less than 5% of that of the housing grooves, it is difficult to control the behavior of the adhesive layer, while when the depth of the adhesive grooves is more than 200% of that of the housing grooves, it may be difficult to fill the adhesive grooves with the adhesive layer, resulting in a reduction in adhesiveness.
  • the adhesive layer for joining the substrate and the cover plate is used one or more kinds of resin selected among, for example, thermosetting resin, thermoplastic resin, and photosetting resin, although not particularly restricted thereto as long as the material can join the substrate and the cover plate to fix the optical fibers.
  • the adhesive layer for joining the substrate and the cover plate is preferably formed of photosetting resin.
  • photosetting resin at least one of the substrate and the cover plate is preferably formed of optically-transparent material.
  • Fig. 1 is a front elevational view of an optical fiber array 10 according to the present embodiment
  • Fig. 2 is a partially enlarged view of one end portion of the optical fiber array 10
  • Fig. 3 is a disassembled perspective view of the optical fiber array 10.
  • the optical fiber array 10 includes: optical fibers 24 drawn out from optical fiber ribbons 20; a substrate 30 with housing grooves 34 for housing the optical fibers 24 formed therein; a cover plate 12 for covering the optical fibers 24 that are housed in the housing grooves 34 ; and an adhesive layer 16 for joining the substrate 20 and the cover plate 12 (refer to Fig. 2) .
  • the optical fiber array 10 is arranged in such a manner that the optical fibers 24 drawn out from the two tiered optical fiber ribbons 20 are fixed by the substrate 30 and the cover plate 12 (refer to Fig. 3), the arranging manner is not restricted thereto, and it may be arranged that the optical fibers 24 drawn out from one tiered optical fiber ribbon 20 or multiple tiered optical fiber ribbons 20 are fixed by the substrate 30 and the cover plate 12.
  • the optical fiber ribbons 20 are each formed into a ribbon shape by bundling and coating several optical fibers 24 (e.g. 8 fibers) coated with first coating portions 22 with a second coating portion 23.
  • the optical fibers 24 are made of glass to transmit optical signals therethrough, in which around a core 24a for transmitting optical signals therethrough, there is formed a clad 24b as a glass layer having a refractive index different from that of the core 24a (refer to Fig. 2).
  • the first coating portions 22 and the second coating portions 23 are adapted to coat and protect the optical fibers 24, and are formed of UV acrylic resin.
  • the diameter of the optical fibers 24 is about 125 ⁇ m, while about 250 ⁇ m with being coated with the first coating portions 22, and the diameter of the cores 24a is about 9 ⁇ m.
  • ribbon-shaped ones are used here, but not particularly restricted thereto as long as the optical fibers 24 can be drawn out therefrom, and multicore cables may be used, for example.
  • the substrate 30 is a member for fixing the optical fibers 24 that are drawn out from the optical fiber ribbons 20.
  • the material of the substrate 30 is not particularly restricted as long as it has an excellent flatness and a high shape-retaining performance when the outer shape is processed, and there can be cited, for example, inorganic materials such as glass, silicon, and ceramic, metallic materials such as copper, iron, and nickel, and organic materials such as engineering plastic.
  • inorganic materials which are less likely to be deformed by heat and humidity, are preferable, and the substrate is here formed of transparent glass.
  • the width of the substrate 30 is formed within 2 to 15mm (preferably 5 to 9mm) ; the length (in the axial direction of the optical fibers 24) of the substrate 30 is formed within 5 to 20mm (preferably 10 to 15mm) ; and the thickness of the substrate 30 is formed within 0.5 to 2.0mm (preferably 1.0 to 1.5mm).
  • the substrate 30 includes a fiber mounting portion 31 for mounting the optical fibers 24 that are drawn out from the optical fiber ribbons 20 thereon and a ribbon mounting portion 32 for mounting the optical fiber ribbons 20 thereon.
  • the housing grooves 34 for housing the optical fibers 24 and adhesive grooves 36 for introduction of the adhesive layer 16.
  • a plurality of the housing grooves 34 are provided in the upper surface of the fiber mounting portion 31 from the ribbon mounting portion 32 side toward the front side at a given array pitch, for example, at approximately the same array pitch (e.g. 127 ⁇ m) as the diameter of the optical fibers 24.
  • the housing grooves 34 are each formed cross-sectionally into a V shape so as to be capable of sufficiently stably fixing the optical fibers 24, and specifically to have a depth (e.g. 150 ⁇ m) greater than the diameter of the optical fibers 24 with the angle ⁇ 1 (refer to Fig. 2) between the forming faces of the housing grooves 34 being within 55 to 95° (e.g. 70°).
  • the outermost housing grooves 34 will be referred to as housing grooves 34a.
  • the adhesive grooves 36 are formed between the opening edges of the outermost housing grooves 34a and the end portions of the substrate 30 for introduction of the adhesive layer 16. It is noted that the adhesive grooves 36 are here formed cross-sectionally into a V shape, although not particularly restricted thereto as long as the shape can increase the adhesive area and control the behavior of the adhesive layer 16 due to expansion/shrinkage with the adhesive layer 16 being introduced therein.
  • the angle ⁇ 2 (refer to Fig. 2) between the forming faces of the adhesive grooves 36 that are each formed cross-sectionally into a V shape is preferably 55 to 95°, more preferably 65 to 85°, and most preferably 60 to 80°.
  • the angle ⁇ 2 here employs 70°.
  • the depth of the adhesive grooves 36 is preferably 5% or more to 200% or less of that of the housing grooves 34, and the adhesive grooves 36 are here formed to have a depth of 10 to 300 ⁇ m for the depth of the housing grooves 34 of 150 ⁇ m.
  • the adhesive grooves 36 are formed parallel with the housing grooves 34 for housing the optical fibers. It is noted that the direction in which the adhesive grooves 36 are formed is not particularly restricted thereto, and may be formed in any direction.
  • the adhesive grooves 36 are preferably formed in the vicinity of the outermost housing grooves 34a and of the end portions of the substrate 30.
  • the adhesive grooves 36 formed in the vicinity of the housing grooves 34a will be referred to as adhesive grooves 36a, while those formed in the vicinity of the end portions of the substrate 30 as adhesive grooves 36b (refer to Figs. 1 and 2).
  • the value of G/W is defined as an occupation rate, where W is referred to as substrate end portions width representing the width between the opening edge of the housing grooves 34a and the end portion of the substrate 30, and G is referred to as total adhesive grooves width representing the summation of the widths of a plurality of the adhesive grooves 36 when formed between the opening edges of the housing grooves 34a and the end portions of the substrate 30.
  • the value of the occupation rate G/W is preferably in a range of 0.03 to 1.0, and the number of the adhesive grooves 36 may be selected appropriately so as to keep the range.
  • the value of G/W is less than 0.03, the area where the adhesive grooves are formed is so small that it is difficult to control the behavior of the adhesive layer by the forming faces of the adhesive grooves.
  • Fig.1 to Fig. 3 show the case where a plurality of adhesive grooves 36 are formed continuously, the adhesive grooves 36 may be formed to have a certain interval therebetween as shown in Fig. 4.
  • the housing grooves 34 and the adhesive grooves 36 may be formed, for example, by cutting the substrate 30 in the direction in which the grooves are to be formed using a groove forming machine (e.g. dicing saw) or by applying resist to the substrate 30 and then removing the resist in the direction in which the grooves are to be formed by means of a photographic method to perform an etching process.
  • a groove forming machine e.g. dicing saw
  • resist e.g. dicing saw
  • the ribbon mounting portion 32 is for mounting and fixing the optical fiber ribbons 20 thereon, and is formed unevenly with respect to the fiber mounting portion 31 so that the optical fibers 24 drawn out from the optical fiber ribbons 20 are housed in the housing grooves 34.
  • the length (in the axial direction of the optical fibers 24) of the ribbon mounting portion 32 is formed so that the optical fiber ribbons 20 can be placed thereon stably, for example, and may be determined appropriately in accordance with the shape of the optical fiber ribbons, etc., to be used.
  • the depth of the ribbon mounting portion 32 is formed within a range where the optical fibers 24 drawn out, respectively, from the first and second tiered optical fiber ribbons 20 are bent by the same amount, for example.
  • the cover plate 12 is a member for covering the optical fibers 24 that are housed in the housing grooves 34.
  • the cover plate 12 is preferably formed of the same material as that of the substrate 30, and is here formed of transparent glass.
  • the width of the cover plate 12 may be approximately the same as that of the substrate 30, but is preferably smaller than that of the substrate 30.
  • the thickness of the cover plate 12 is formed to be approximately the same as that of the substrate 30, while the length (in the axial direction of the optical fibers 24) of the cover plate 12 is formed within 2 to 10mm (preferably 4 to 10mm). Since the thickness of the substrate 30 is approximately the same as that of the cover plate 12, it is possible to prevent warpage of the optical fiber array 10. It is noted that the optical fibers 24 from which the first coating portions 22 are removed from the cover plate 12 through the ribbon mounting portion 32 will be coated and protected with the adhesive forming the adhesive layer 16 or some other adhesive, etc.
  • the adhesive layer 16 is for joining the substrate 30 and the cover plate 12 to fix the optical fibers 24.
  • the material of the adhesive layer 16 is not particularly restricted as long as it has capable of joining the substrate 30 and the cover plate 12 to fix the optical fibers 24, and there can be cited one or more kinds of resin selected among, for example, thermosetting resin such as epoxy resin and phenol resin, thermoplastic resin such as polysulphone and polyimide, and photosetting resin such as acrylic resin and ultraviolet-curing resin.
  • the layer is here formed of photosetting resin adhesive (UV acrylic resin) .
  • the adhesive layer 16 is formed by putting uncured adhesive into the housing grooves 34 with the optical fibers 24 housed therein and the adhesive grooves 36 and then applying ultraviolet rays to cure the adhesive.
  • the substrate 30 and the cover plate 12 are preferably formed of optically-transparent material (e.g. glass).
  • the adhesive layer 16 the thermal expansion coefficient of which is greater than that of the substrate 30 and the cover plate 12 by one or more orders, is to be expanded/shrinked under the effect of temperature.
  • the adhesive layer 16 is introduced into the adhesive grooves 36 that are formed between the housing grooves 34a and the end portions of the substrate 30 as shown in Fig. 2, the adhesive area between the substrate 30 and the cover plate 12 is increased.
  • the substrate 30 has a rigidity greater than that of the adhesive layer 16, whereby the adhesive layer 16 is introduced into the adhesive grooves 36 to allow the forming faces of the adhesive grooves 36 to control the behavior of the adhesive layer 16 caused by expansion/shrinkage in the adhesive layer 36.
  • the adhesiveness between the substrate 30 and the cover plate 12 is increased so as not to allow the optical fibers 24 to be displaced in the housing grooves 34, it is possible to keep good transmission characteristics.
  • the adhesive grooves 36 are each formed cross-sectionally into a V shape parallel with the housing grooves 34 for housing the optical fibers, it is possible to form the adhesive grooves in the substrate 30 relatively easily. Further, stress due to expansion/shrinkage in the adhesive layer 16 that may be applied significantly onto the adhesive surface, etc., in the vicinity of the outermost housing grooves 34a can be reduced by the forming faces of the adhesive grooves 36a that are formed in the vicinity of the housing grooves 34a to increase the adhesive strength.
  • the adhesive grooves 36b are formed in the end portions of the substrate 30, the adhesive area in the end portions of the substrate 30 can be increased to prevent moisture from immersing through between the substrate 30 and the adhesive layer 16, resulting in an increase in adhesiveness. Then, since the adhesive grooves 36 are each formed to have a depth of 5 to 200% of that of the housing grooves 34, it is easy to control the behavior of the adhesive layer 16, resulting in an increase in adhesiveness.
  • the substrate 30 and the cover plate 12 are formed of highly optically-transparent glass and photosetting resin is employed as the adhesive forming the adhesive layer 16, light to be applied when curing the photosetting resin is reflected and scattered at the adhesive grooves 36 to facilitate the degree of curing to be accelerated and the state of curing to be homogenized, resulting in an increase in the adhesiveness of the photosetting resin.
  • a substrate 10 was cut out from a flat plate made of borosilicate glass to have a dimension of 9mm width ⁇ 12mm length ⁇ 1.5mm thickness, and a ribbon mounting portion 32 (having a length of 4mm) was formed in the rear part thereof.
  • 16 housing grooves 34 having a cross-sectionally V shape were formed on either side of the center of a fiber mounting portion 31 (32 grooves in total) at an array pitch of about 127 ⁇ m.
  • the housing grooves 34 have an angle ⁇ 1 of 70°, a depth of 150 ⁇ m, and the same length (in the axial direction of optical fibers 24) as that of the cover plate 12.
  • the housing grooves 34 were formed within a range of 3mm on either side of the center of the fiber mounting portion 31 (about 6mm in total).
  • adhesive grooves 36 were formed between the opening edges of the outermost housing grooves 34s and the end portions of the substrate 10. It is noted that in the Example 1, the adhesive grooves 36 were formed only in the vicinity of the outermost housing grooves 34a. That is, one adhesive groove 36a was formed on either side (two grooves in total).
  • the adhesive grooves 36 have an angle ⁇ 2 of 70°, a depth of 10 ⁇ m, and the same length (in the axial direction of the optical fibers 24) as that of the cover plate 12.
  • the cover plate 12 was produced by cutting a flat plate made of borosilicate glass to have a dimension of 9mm width ⁇ 5mm length ⁇ 1.5mm thickness.
  • first-coated optical fibers 24 were bundled to prepare an optical fiber ribbon 20.
  • the optical fibers 24 were formed of silica glass.
  • Four optical fiber ribbons 20 were produced with optical fibers 24 being drawn out therefrom by peeling the first coating portions 22 (having a diameter of about 250 ⁇ m) and the second coating portions 23 of the optical fiber ribbons 20 using a stripper, and were arranged horizontally and vertically on the ribbon mounting portion 32 to house the drawn optical fibers 24 in the housing grooves 34.
  • adhesive was put into the housing grooves 34 with the optical fibers 24 housed therein and the adhesive grooves 36, etc. , to be fixed with the cover plate 12.
  • UV acrylic resin was employed as the adhesive and was cured by applying ultraviolet rays.
  • the cured adhesive formed an adhesive layer 16. Finally, portions of the adhesive layer 16 and/or the optical fibers 24 protruding from the substrate 10 were cut or polished to obtain an optical fiber array 10 according to the Example 1. It is noted that the cutting and grooving operations were performed using a diamond cutter and/or a diamond saw, etc.
  • a table summarizing each value of the occupation rate G/W, adhesive groove depth, adhesive groove angle, housing groove depth, and housing groove angle of the optical fiber array 10 according to the present Example 1 is shown in Fig. 5. It is noted that the table in Fig. 5 also summarizes information about Example 2 to Example 8 and Example 1 to Comparative Example 3 to be described hereinafter.
  • Substrates 10 were produced under the conditions of Example 2 to Example 8 shown in the table in Fig. 5 using a cover plate 12, optical fibers 24, and adhesive equivalent to those in the Example 1 , and the same processes as shown in the Example 1 were performed to produce optical fiber arrays 10 each having an occupation rate G/W, adhesive groove depth, adhesive groove angle, housing groove depth, and housing groove angle as shown in the table in Fig. 5, and the obtained optical fiber arrays 10 were referred to as the Example 2 to Example 8. It is noted that the fiber mounting portion 31 and the ribbon mounting portion 32 have the same length in all the samples. Although in the sample according to each example, as the occupation rate G/W is increased, the number of adhesive grooves 36 is also increased, the adhesive grooves 36 were formed sequentially from near the opening edges of the housing grooves 34 so as to adjoin the adhesive grooves 36a.
  • Substrates 10 was produced under the conditions of Comparative Example 1 to Comparative Example 3 shown in the table in Fig. 5 using a cover plate 12, optical fibers 24, and adhesive equivalent to those in the Example 1, and the same processes as shown in the Example 1 were performed to produce optical fiber arrays 10 each having an occupation rate G/W, adhesive groove depth, adhesive groove angle, housing groove depth, and housing groove angle as shown in the table in Fig. 5, and the obtained optical fiber arrays 10 are referred to as the Comparative Example 1 to Comparative Example 3. It is noted that the fiber mounting portion 31 and the ribbon mounting portion 32 have the same length in all the samples.
  • Boiling tests according to the Example 1 to Example 8 and the Comparative Example 1 to Comparative Example 3 were performed. Water was first boiled, and then each sample was put in the water for a predetermined time to observe the appearance of each sample at predetermined time points (15h, 36h, and 60h).
  • Coupling losses according to the Example 1 to Example 8 and the Comparative Example 1 to Comparative Example 3 were measured.
  • An aligning device 40 (PAW278 manufactured by Moritex Corporation) shown in Fig. 6 was used for the measurements. The measuring method will here be described.
  • equivalent optical fiber arrays 10 e.g. ones according to the Example 1 were first placed to face each other as shown in Fig. 6(a).
  • Light having an input power P1 (1mW) was input through one optical fiber array 10 arranged on the side of a light emitting section 42 and was output through the other optical fiber array 10 arranged on the side of a light receiving section 44 to measure the output power P2, and the coupling loss L was calculated from the input power P1 and the output power P2 using the following formula (1).
  • the above-described boiling test was performed for 60 hours using the optical fiber array 10 on the output side.
  • light having an input power P1 (1mW) was input through the optical fiber array 10, which was not subjected to the boiling test, arranged on the side of the light emitting section 42 and was output through the deteriorated optical fiber array 10, which was subject to the boiling test for 60 hours, arranged on the side of the light receiving section 44 to calculate the coupling loss L2 after the deterioration of the optical fiber array 10 from the input power P1 and the output power P2 using the formula (1).
  • the difference between the initial value L1 and the value L2 after the deterioration was defined as a coupling loss value.
  • the coupling loss value is preferably 0.3dB or less, and more preferably 0.2dB or less. This is for the reason that since the optical fiber array 10 may be joined with, for example, a splitter for splitting an optical signal into multiple signals, there can occur a loss at every branch when the coupling loss value is more than 0.3dB, resulting in an excessive coupling loss in total.
  • the substrate 30 was warped after the measurement, and peeling occurred at the bottom of the adhesive grooves 36. Accordingly, it was found that when the depth of the adhesive grooves 36 was more than 200% of that of the housing grooves 34, it might be difficult to fill the adhesive grooves 36 with adhesive, resulting in a reduction in adhesiveness. In consideration of the relationship between the depth in a range of the housing grooves 34 and the depth of the adhesive grooves 36, it was found that when the adhesive grooves 36 had a depth of 5 to 200% of that of the housing grooves 34, it was possible to keep high transmission characteristics.
  • the increase in the adhesiveness between the substrate 30 and the cover plate 12 was contributed by the fact that the substrate 30 and the cover plate 12 were formed of highly optically-transparent glass, and that light to be applied when curing the UV acrylic resin was reflected and scattered at the adhesive grooves 36 to facilitate the degree of curing of the adhesive to be accelerated and the state of curing to be homogenized. It was further estimated that the increase was contributed by the fact that since the degree of curing of the adhesive was accelerated and the state of curing was homogenized, the thermal expansion coefficient of the adhesive layer 16 was reduced to suppress the behavior of the adhesive layer 16.
  • the optical fiber array according to the present invention is available when positioning and fixing optical fibers accurately such as in the case where the optical fibers are connected to an optical connector, an optical transmitting and receiving device, and/or various kinds of optical devices.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
EP05721542A 2004-03-30 2005-03-18 Lwl anordnung Withdrawn EP1731935A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004100872A JP2005284157A (ja) 2004-03-30 2004-03-30 光ファイバアレイ
PCT/JP2005/005615 WO2005098495A1 (ja) 2004-03-30 2005-03-18 光ファイバアレイ

Publications (2)

Publication Number Publication Date
EP1731935A1 true EP1731935A1 (de) 2006-12-13
EP1731935A4 EP1731935A4 (de) 2007-08-01

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JP2005284157A (ja) 2005-10-13
WO2005098495A1 (ja) 2005-10-20
EP1731935A4 (de) 2007-08-01
US20070019920A1 (en) 2007-01-25
US7578625B2 (en) 2009-08-25

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